Compute (1+x+x^2+x^3)^2

Homework Statement:
Compute
Relevant Equations:
(1+x+x^2+x^3)^2
This is a problem from Gelfand's Algebra. Needed to verify my solution.

My solution to the problem above was the following.

1+2x+3x^2+4x^3+3x^4+2x^5+x^6

Thanks.

ehild
Homework Helper
Homework Statement: Compute
Homework Equations: (1+x+x^2+X^3)^2

This is a problem from Gelfand's Algebra. Needed to verify my solution.

My solution to the problem above was the following.

1+2x+3x^2+4x^3+3x^4+2x^5+x^6

Thanks.
It is correct.

YoungPhysicist
Thanks a lot. :)